/* SPDX-License-Identifier: BSD-2-Clause */

/**
 *  @file
 *
 *  If required this ISR is used to bump a count of interval "overflow"
 *  interrupts which have occurred since the timer was started.  The
 *  number of overflows is taken into account in the benchmark_timer_read()
 *  routine if necessary.
 *
 *  To reduce overhead this is best to be the "rawest" hardware interupt
 *  handler you can write.  This should be the only interrupt which can
 *  occur during the measured time period.
 *
 *  @note This file is USUALLY in assembly and is LEAN AND MEAN.
 *        Any code in this isr is pure overhead which can perturb
 *        the accuracy of the Timing Test Suite.
 */

/*
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <rtems.h>
#include <rtems/btimer.h>

extern uint32_t         _Timer_interrupts;

void timerisr( void )
{
  /*
   *  _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS  (usually in microseconds)
   *  return from interrupt
   */
}
